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Follow the strain isolation technique on Let's Grow Mushrooms, and then select sectors early which are brown in color. By the second or third transfer, you'll see stones developing, and this is only about 1 month after the original swipe of spores on agar.

Now, take each stone and move it to a new dish. Soon, the mycelium will grow out and you'll see fresh stones developing, and if they're good strains, the sclerotia is forming long before the mycelium reaches the edge of the plate. Pick strains which form four or five stones within two weeks and use these for your grain masters. -- RR